Length, width and shape answer different questions. A regional size conversion cannot describe all three.
The centimetre number may describe a label rather than a foot
Nike’s men’s footwear chart distinguishes the CM/JP size printed on a box or shoe label from measured foot length. The chart presents them as separate information. A centimetre-looking number therefore needs its column heading before it can be interpreted; copying the number alone loses an important part of its meaning.
This also separates a person’s foot from a removable insole. Foot length describes the wearer; insole length describes a component of the shoe. An insole photograph cannot establish that its entire outline is usable toe space. The two measurements can be useful evidence, but they do not become interchangeable simply because both use centimetres.
For DGO Spreadsheet sneaker references, a product name identifies the model being discussed. The selected listing supplies its own sizing information. A general brand chart explains the brand’s published system; it does not verify that an independent catalogue item follows that system or has the same internal measurements.
A width option is different from a longer shoe
Length and width are separate parts of footwear sizing. New Balance offers width designations alongside size numbers and explains that pressure around the sides or top of the foot may call for a wider option. Its US material identifies different standard width letters for men and women, so a width letter also needs the appropriate product context.
Nike’s chart describes wide and extra-wide footwear using additional toe-box girth. Girth is a measurement around a shape, which is different from a straight line across a photograph. A top-down image can show the outline of a toe box, but it cannot supply the internal circumference specified by a manufacturer.
The practical distinction is that “more room” can mean several things. Additional length at the front does not describe how the midfoot or toe area is shaped. A statement that a shoe feels narrow is more informative when it identifies the location and the width version involved, rather than becoming a universal instruction to buy a longer size.
Two feet of equal length can have different proportions
The Brannock fitting system considers heel-to-toe length and heel-to-ball length. The second measurement locates the ball joint relative to the heel. Its fitting explanation illustrates feet with the same overall length but different proportions, showing why the longest toe does not tell the whole story.
This is relevant to where a shoe bends. The relationship between the ball of the foot and the shoe’s flexing area introduces a shape question that a regional conversion table does not answer. It also explains why two people who report the same measured foot length can describe a particular model differently.
Brannock treats a measurement as the beginning of fitting and recognizes the role of manufacturing and style differences. The distinction helps explain why a single length reading cannot support a guarantee about an untried pair.
The last gives a shoe its three-dimensional shape
A shoe last is the form involved in shaping footwear. New Balance’s New Zealand customer information explains that shoes made on different lasts can have different overall fit and feel, including a distinction between its SL-1 and SL-2 lasts. The example concerns shape within one manufacturer, rather than a conversion between brands.
That makes model identity important. A shared brand name or size number does not establish a shared last. Neither an upper’s visual resemblance to another shoe nor a similar outsole length identifies the form used to construct it. A published, model-specific fit statement is more precise than an assumption based on brand alone.
Different pieces of sizing information
Swipe across the table to see every column.
| Information | What it describes | What remains unresolved |
|---|---|---|
| Foot length | A measurement of the wearer | Width and the distribution of space in a shoe |
| Size and width labels | A manufacturer’s stated size options | The particular model’s shape and individual fit |
| Removable insole length | The measured shoe component | Usable internal space and the complete fit |
| Model or last information | The construction reference behind the shape | Whether the selected pair suits the wearer |
Photographs explain appearance more readily than internal fit
Side, front and heel views reveal different parts of a sneaker’s visible shape. They can help distinguish models and identify the photographed size label. They cannot show how a particular wearer’s foot occupies the shoe, even when the outside proportions look familiar.
That gives model photographs and measurements complementary roles. A photograph can document the pair being discussed; a clearly defined measurement adds a dimension; a fitting evaluates the shoe on a foot. Treating those as separate kinds of evidence keeps a visual observation from becoming a fit claim.
Where the size chart fits into the bigger picture
The US, UK and EU conversion guide covers labels and measurement units. This explanation concerns the additional reasons a converted size can feel different: width, foot proportions and the shoe’s shape. It does not assign an across-the-board size adjustment to Nike, New Balance or any catalogue model.
When exploring sneakers, the useful question is which part of fit a piece of information actually describes. A complete model name, a clearly defined chart and the correct width option add different context. Keeping that distinction makes a product reference more meaningful than a size number on its own.